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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      function Star(uame, age) {
        this.uame = uame;
        this.age = age;
        // this.sing = function () {
        //   console.log("go");
        // };
      }
      Star.prototype.sing = function () {
        console.log(111);
      };
      var ldh = new Star("刘德华", 18);
      var zxy = new Star("张学友", 18);
      console.log(ldh.sing() === zxy.sing());
      // 公共属性定义到构造函数上 公共方法放到原型对象里面
    </script>
  </body>
</html>
